Derrick



Patented Aug. 7, 1945 UNITED STATES PATENT OFFICE DERRICK Alois Cibulka, Highlands, Tex.

Application April 19, 1944, Serial No. 532,023

(Cl. 18S-13) `2 Claims.

This invention relates to a derrick.

An object of the invention is to provide a very strong, but light type of derrick particularly designed for use in well drilling or for supporting tanks or other loads.

Derricks, as now constructed for similar purposes, are statically determinate structures requiring a large number of members in order to obtain the triangular pattern for bracing. Therefore, the fabrication and erection is very costly; also a large area of the derrick is exposed to wind pressure making the derrick very subject to being blown down in case of storm.

The present invention embodies a rigid, frame type construction which is statically indeterminate and depends Iupon the rigidity of its few members and their connections for its stability and supporting strength.

With the above and other objects in view the invention has particular relation to certain features of construction and arrangement of parts examples of which are given in this specification and illustrated in the accompanying drawing wherein- Figure 1 shows an elevational View of the derrick.

Figure 2 shows an elevational view of another embodiment.

Figure 3 shows a cross sectional view taken on the line 3-3 of Figure 2.

Figure 4 shows a cross sectional view taken on the line 4-4 of Figure 2, and

Figure 5 shows a cross sectional view taken on the line 5-5 of Figure 2.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the corner legs are indicated by the numeral I. They converge slightly upwardly and are united at their upper end by the crown block la. They are connected by the cross braces 2 which are spaced apart vertically. These cross braces are secured to the legs in any approved manner.

As shown in Figure l there are the upper and lower angle bars 3, 3a which may be used for bracing between the legs I and the corresponding horizontal bar 2; or the cross braces 3b, 3b may be employed. Gusset plate type connections 6 may be employed for connecting these parts together as shown in Figure 1.

As illustrated in Figure 2 either gusset plate type connections or bracket type connections 1 may be employed for connecting the horizontal braces 2 to the legs I.

There are the upper intermediate and lower rings 4 in a common plane with the upper intermediate and lower horizontal braces 2. These rings are of a diameter to lit closely within said bracesv and are bolted thereto as shown in Figures 3, 4, and 5.

The intermediate and lower rings are further anchored in place by the diagonal braces 5 which are anchored at their outer ends to the legs I and at their inner ends to the corresponding rings 4. Gusset plate type connectionsI 6 may also be used for these anchorages.

What I claim is:

1. A derrick comprising upright corner legs, vertically spaced series of horizontal braces con necting said legs, rigid rings in the horizontal planes of the series of braces and anchored to said braces.

2. A d'errick comprising upstanding corner legs, vertically spaced series of braces connected to said legs, rings of rigid material within the braces of the respective series, means connecting said rings to the braces and diagonal braces connected to the legs and 'to the respective rings.

ALOIS CIBULKA. 

